This is the 7761st most frequent Spanish word.
luxemburgo
Luxemburgo: Luxembourg (a country in Europe).
In this sentence, 'Luxemburgo' is a proper noun used as the name of a country.
Luxemburgo es un país europeo pequeño pero muy influyente.
Luxembourg is a small but very influential European country.
Here, 'Luxemburgo' is part of the name used in the adjective form to refer to something belonging to Luxembourg.
El luxemburgués es una de las lenguas oficiales de Luxemburgo.
Luxembourgish is one of the official languages of Luxembourg.
In this instance, 'Luxemburgo' is again a proper noun denoting the country as a destination.